CSS flex-basis Property
Description
The flex-basis
property determines the base of the flex , which is the initial size of the element. Similar to the width and height properties to which the contents of an element are added.
- Initial value
- auto
- Applies to
- Flex items, including in-flow pseudo-elements
- Inherited
- No
- Media
- Visual
- Computed value
- As specified, but with relative lengths converted into absolute lengths
- Animatable
- Yes
- CSS Version
- CSS3
- JavaScript syntax
- object.style.flexBasis
Syntax
flex-basis: auto | <size>
Values
- autoIndicates auto size based on the content of the item.
- <size>Specifies the size of the element in px, mm, pt or in percent along the main axis. In this case, the size is calculated relative to the parent. A negative value is not valid.
Example
<div class="flex-container">
<div class="flex-item one">First</div>
<div class="flex-item two">Second</div>
<div class="flex-item three">Third</div>
</div>
.flex-container {
display: flex;
height: 300px;
color: #fff;
font-size: 2em;
flex-flow: column wrap;
}
.flex-item {
display: flex;
align-items: center;
justify-content: center;
}
.one {
background: #508694;
margin-right: 10px;
flex-basis: 100%;
order: 1;
}
.two {
background: #BB844C;
margin-bottom: 10px;
flex: 1 1 0;
order: 2;
}
.three {
background: #929D79;
flex: 1 1 0;
order: 3;
}
Browser Support
Desktop | |||||
11 | 12 | 29 | 22 | 12.1 | 9 |
Tablets / Mobile | |||||
![]() |
|||||
4.4 | 29 | 22 | 12.1 | 9 | ? |
Last updated by CSSPortal on: 4th November 2019
CSS Properties
- align-content
- align-items
- align-self
- all
- animation
- animation-delay
- animation-direction
- animation-duration
- animation-fill-mode
- animation-iteration-count
- animation-name
- animation-play-state
- animation-timing-function
- backface-visibility
- background
- background-attachment
- background-blend-mode
- background-clip
- background-color
- background-image
- background-origin
- background-position
- background-repeat
- background-size
- border
- border-bottom
- border-bottom-color
- border-bottom-left-radius
- border-bottom-right-radius
- border-bottom-style
- border-bottom-width
- border-collapse
- border-color
- border-image
- border-image-outset
- border-image-repeat
- border-image-slice
- border-image-source
- border-image-width
- border-left
- border-left-color
- border-left-style
- border-left-width
- border-radius
- border-right
- border-right-color
- border-right-style
- border-right-width
- border-spacing
- border-style
- border-top
- border-top-color
- border-top-left-radius
- border-top-right-radius
- border-top-style
- border-top-width
- border-width
- bottom
- box-decoration-break
- box-shadow
- box-sizing
- break-after
- break-before
- break-inside
- caption-side
- caret-color
- clear
- clip-path
- color
- column-count
- column-fill
- column-rule
- column-rule-color
- column-rule-style
- column-rule-width
- column-span
- column-width
- columns
- content
- counter-increment
- counter-reset
- counter-set
- cursor
- direction
- display
- empty-cells
- filter
- flex
- flex-basis
- flex-direction
- flex-flow
- flex-grow
- flex-shrink
- flex-wrap
- float
- font
- font-family
- font-feature-settings
- font-kerning
- font-language-override
- font-size
- font-size-adjust
- font-stretch
- font-style
- font-synthesis
- font-variant
- font-variant-alternates
- font-variant-caps
- font-variant-east-asian
- font-variant-ligatures
- font-variant-numeric
- font-variant-position
- font-weight
- grid
- grid-area
- grid-auto-columns
- grid-auto-flow
- grid-auto-rows
- grid-column
- grid-column-end
- grid-column-gap
- grid-column-start
- grid-gap
- grid-row
- grid-row-end
- grid-row-gap
- grid-row-start
- grid-template
- grid-template-areas
- grid-template-columns
- grid-template-rows
- hanging-punctuation
- height
- hyphens
- image-orientation
- justify-content
- justify-items
- justify-self
- left
- letter-spacing
- line-break
- line-height
- list-style
- list-style-image
- list-style-position
- list-style-type
- margin
- margin-bottom
- margin-left
- margin-right
- margin-top
- max-height
- max-width
- min-height
- min-width
- mix-blend-mode
- object-fit
- object-position
- opacity
- order
- orphans
- outline
- outline-color
- outline-offset
- outline-style
- outline-width
- overflow
- overflow-wrap
- overflow-x
- overflow-y
- padding
- padding-bottom
- padding-left
- padding-right
- padding-top
- perspective
- perspective-origin
- place-content
- place-items
- place-self
- position
- quotes
- resize
- right
- shape-image-threshold
- shape-margin
- shape-outside
- tab-size
- table-layout
- text-align
- text-align-last
- text-combine-upright
- text-decoration
- text-decoration-color
- text-decoration-line
- text-decoration-style
- text-emphasis
- text-emphasis-color
- text-emphasis-position
- text-emphasis-style
- text-indent
- text-justify
- text-orientation
- text-overflow
- text-shadow
- text-transform
- text-underline-position
- top
- transform
- transform-origin
- transform-style
- transition
- transition-delay
- transition-duration
- transition-property
- transition-timing-function
- unicode-bidi
- vertical-align
- visibility
- white-space
- widows
- width
- word-break
- word-spacing
- word-wrap
- writing-mode
- z-index